Market Orders

What Is a Market Order?

A market order is the simplest way to buy or sell: you tell the platform what you want to trade and how much, and your order is filled immediately at the best available price in the market.

You use a market order when getting in or out quickly matters more than getting a precise price. It is designed for speed and execution certainty, not for fine-tuning the exact level where you trade.

For AvaTrade clients, this idea applies across spot FX, CFDs and other leveraged products on indices, shares, commodities, and crypto.

In exchange-traded shares, rules such as the National Best Bid and Offer (NBBO) and FINRA guidance set standards for best available pricing in U.S. markets; the underlying principle is the same: your market order is routed to be filled at the best prices currently on offer, but the final fill can still differ slightly from the last price you saw on screen.

That difference is often called slippage – and it is a normal part of trading in moving markets, not a mistake or a hidden fee.

How a Market Order Is Filled

Behind the scenes, your market order is matched against the best prices currently available in the order book.

• On a typical order book, there is a best bid (the highest price someone is willing to buy) and a best ask (the lowest price someone is willing to sell).
• When you place a buy market order, you “hit” the best ask and, if needed, the next levels above it.
• When you place a sell market order, you “hit” the best bid and then the levels below it.

Because prices and available volumes are changing constantly, the final fill price is only known once your order actually reaches the market.

A Simple Slippage Example

Imagine you see the following prices on screen for an index CFD:

• Best ask (sell) shown: 100.00 (100 units available)
• Next level in the book: 100.02 (200 units available)
• Next after that: 100.04 (300 units available)

If you send a buy market order for 500 units:

• 100 units might fill at 100.00
• The next 200 units at 100.02
• The remaining 200 units at 100.04

Your average fill price would be slightly higher than 100.00, because your order had to “walk up” the book to find enough liquidity. That small difference between the last price you saw and your average fill is slippage.

In fast-moving or thinly traded markets, prices and available size can change even more by the time your order is executed – which is why:

• Larger market orders in less liquid instruments are more likely to move through several price levels.
• For bigger tickets or thinner markets, traders often consider limit or marketable-limit orders to keep more control over the worst acceptable price.

A market order provides speed and a high chance of getting filled, but does not guarantee that you will trade at the exact last price you saw.

Practise placing small market orders in a fast-moving demo environment with AvaTrade to see how slippage and liquidity work in real time.

When To Use – And When to Avoid – Market Orders

A market order can be a useful tool when used in the right context. The key is to match the order type to the market conditions and your priorities.

When a Market Order Usually Makes Sense

A market order is often appropriate when:

• You are trading a highly liquid market: Major FX pairs, leading indices and heavily traded large-cap shares usually have tighter spreads and deeper order books, making it easier to get filled close to the quoted price.
• Speed matters more than a perfect entry level: For example, when you want to close a position quickly to manage risk, or when you are entering with a small size and are less sensitive to a few points of slippage.
• Order size is small relative to typical volume: If your order is small compared with the usual traded volume, it is less likely to move through many levels of the book.
• You have already decided on your risk in advance: You know where your stop loss will go and how much of your account you are prepared to risk on this trade. The market order is simply a way to implement that decision quickly.

When You May Want to Avoid a Pure Market Order

You may wish to be more cautious with market orders when:

• The market is thin, or the spread is wide: In less liquid CFDs or outside the main trading session, even a modest market order can move through multiple price levels and result in a worse average fill.
• Volatility is unusually high (e.g. around major news): Prices can gap or “jump” between levels during major announcements, making slippage more likely. Some traders prefer a limit or marketable-limit order to keep more control over the worst acceptable price.
• You are trading a larger ticket: Bigger orders have a higher chance of sweeping the book. In such cases, using staged entries or price-limited orders may offer a better balance between execution and price control.
• You care more about the price than about getting filled: If your priority is “only trade if I can get this or better”, a limit order is usually a more suitable tool than a pure market order.

In short, use market orders when you need speed in a liquid market with a sensible size, and consider limit or marketable-limit orders when price control and slippage risk are more important.

Market vs Limit vs Marketable-Limit Orders

When you place an order, you are really choosing which trade-off you prefer between speed, certainty of being filled, and control over price.

Order Type	How It Works	Main Trade-Off
Market	Fills immediately at the best available prices in the book.	Maximum speed, less control over final price.
Limit	Fills only at your chosen price or better.	Price control, no guarantee of being filled.
Marketable-limit	A limit placed close to the current price, usually inside the spread or just beyond it.	A blend of speed and price protection.

 

“Best When…” Snapshot

• Market order – Best when you are trading a liquid market with a sensible size and must get in or out quickly, accepting some slippage.
• Limit order – Best when the exact price matters more than getting filled, and you are prepared to miss the trade if the market never reaches your level.
• Marketable-limit order – Best when you want to enter or exit quickly, but still keep a clear cap on the worst acceptable price to help manage slippage.

Time-in-force instructions, such as Good for Day (GFD) or Good Till Cancelled (GTC), describe how long your order stays active. Order types such as market, limit, or marketable-limit describe how the price is chosen. You can think of them as two separate choices you make when you place an order.

Practise using market and limit orders side by side in an AvaTrade demo account to see how execution and pricing differ in live market conditions.

** Disclaimer – While due research has been undertaken to compile the above content, it remains an informational and educational piece only. None of the content provided constitutes any form of investment advice.

FAQ

• When is a market order usually appropriate?

  A market order is usually appropriate in a liquid market, with a sensible trade size, when getting in or out quickly matters more than getting a perfect price.

   
• Can I get a different price than I see on screen?

  Yes. Because prices and available volumes change constantly, your final fill may be slightly better or worse than the last quoted price. This difference is called slippage.

   
• What happens if there isn’t enough liquidity at my price?

  If your market order is large relative to available volume, it may be filled in pieces at several price levels in the order book, leading to a different average fill price than you expected.

   
• : What’s the difference between a market and a marketable-limit order?

  A market order aims to fill immediately at the best available prices, with less control over the final price. A marketable-limit order is a limit set close to the current price, designed to fill quickly but with a clear cap on the worst acceptable price.

   
• How do time-in-force settings like GFD or GTC fit in?

  Time-in-force settings such as Good for Day (GFD) or Good Till Cancelled (GTC) tell your broker how long the order should stay active. They work alongside your order type (market, limit, marketable-limit), which decides how the price is chosen.